/*
 * GRAKN.AI - THE KNOWLEDGE GRAPH
 * Copyright (C) 2018 Grakn Labs Ltd
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package ai.grakn.graql.admin;

import ai.grakn.graql.VarPattern;

import javax.annotation.CheckReturnValue;

/**
 * A unique property of a {@link VarPattern}.
 *
 * This property is unique in that each {@link VarPattern} may have exactly zero or one of each
 * {@link UniqueVarProperty}.
 *
 * @author Felix Chapman
 */
public interface UniqueVarProperty extends VarProperty {

    @CheckReturnValue
    default boolean isUnique() {
        return true;
    }
}
